Monitoring the 222Rn concentration in the air of low-background laboratories by means of an ion-pulse ionization chamber

Abstract

A brief description of a setup based on a large-size air ion-pulse ionization chamber intended for monitoring the concentration of 222Rn in the air of laboratories is given. The sensitivity of the detector used for performing measurements with an air sample containing radon with a volume activity of 10 Bq m−3 makes it possible to attain 10% statistical accuracy in determining the area of a radon peak in a measurement time of 103 s. The results from long-term measurements of radon concentration in the air of ground-based and underground laboratories are presented.